That is a tough one to locate. I mentioned this before, the .09's have little to no parts support. It's easier to find a entire engine than it is to find what your in search for. The .09's in my opinion didn't gain the popularity of the others. This brings me to the next question. You have asked many questions in regards to these engines.  Why do you need a piston /cylinder? Is your current set down on compression or just non existent?  Many times what feels to be lack of compression is the glow head leaking. This requires a piece of glass and some 400 and oil to flatten the seat area of the plug and a NEW copper gasket . This also requires the proper wrenches to tighten the plug which on the older version it has no cylinder head flats.

          I just recently obtained a Tee Dee .09 parts engine and was fortunate that it only required front end venturi parts which are not inexpensive by any means.